Was there no word for son in law in Biblical Koine Greek?

I find it hard to believe that there was no word for that kind of thing but this source explains that Jesus' genealogy is harmonized by that claim. I really want that claim to be true and solidly backed up. I'm at a loss as to how to find out how to back up that claim though. [Why are Jesus' genealogies in Matthew and Luke so different?](https://www.gotquestions.org/Jesus-genealogy.html)